[GreenKeys] Robot 800 TU operation - mark hold?

[Nick England]

I've been restoring a hamfest Robot 800 terminal unit. So far I've fixed
the usual shorted tantalum cap and blown loop keying transistor.
Question - does this thing have mark-hold for no signal? It appears not
from the manual saying it will print due to "noise" when there is no
signal. It has "Autostart Mode" but that just seems to be triggered by the
noise.
Does anyone have experience with this TU? Am I missing or misunderstanding
something?

Otherwise it appears to be a pretty nifty unit and prints from the ITTY and
N3CRK streams just fine.
FYI the manual is here -
https://www.navy-radio.com/rtty/misc/robot800-man.pdf

Cheers,
Nick England K4NYW
www.navy-radio.com
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